JP2022000383A - Vehicle seat - Google Patents

Abstract

To achieve high rigidity and a simple structure of an attachment structure of a coupling mechanism coupled to a striker provided at a floor to a seat cushion in a vehicle seat.SOLUTION: A vehicle seat S includes a seat cushion frame F1 which is rotatably supported on a floor FL at a front part and has a coupling mechanism 20 disengageably coupled to a striker 3 at a rear part. The seat cushion frame has a pair of left and right side frames 5, a front frame 6, and a rear frame 7. Each side frame has a first member 10 including a groove shaped cross section opening to a lateral side and extending longitudinally; and a second member 11 which is coupled to the first member so as to cooperate with the first member and form a closed cross section structure 12 and protrudes downward further than the first member. The coupling mechanism is disposed below the first member and is coupled to the second member.SELECTED DRAWING: Figure 4

Description

The present invention relates to a vehicle seat mounted on a vehicle or the like.

In the second or third row of seats of an automobile, a tumble seat is known in which a seat cushion rotates forward with a folded seat back around its front end to form an upright storage form (for example, a patent). Document 1). Such a tumble seat is rotatably coupled to the floor at the front end of the seat cushion frame and detachably coupled to a striker provided on the floor in a coupling mechanism provided at the rear end of the seat cushion frame. .. The binding mechanism has a receptive hole for receiving the striker and a locking piece protruding into the receptive hole to lock the striker, and the locking piece is manually disengaged from the striker.

Japanese Unexamined Patent Publication No. 2012-131248

In such a tumble seat, the load of the seat and the occupant is supported on the floor via the coupling mechanism and the striker, so that the rigidity of the coupling structure between the coupling mechanism and the seat cushion frame becomes a problem. Further, from the viewpoint of manufacturing, it is preferable that the mounting structure of the coupling mechanism to the seat cushion frame is simple.

In view of the above background, it is an object of the present invention to make the mounting structure of the coupling mechanism for connecting to the striker provided on the floor to the seat cushion in the vehicle seat, which is a tumble seat, highly rigid and simple.

In order to solve the above problems, one aspect of the present invention is a coupling that is rotatably supported with respect to the floor (FL) and is movably coupled to a striker (3) provided on the floor. A vehicle seat (S) including a seat cushion frame (F1) having a rear portion provided with a mechanism (20), wherein the seat cushion frame includes a pair of left and right side frames (5) extending in the front-rear direction and left and right sides. It has a front frame (6) connecting the front ends of the side frames and a rear frame (7) connecting the rear portions of the left and right side frames, and each of the side frames has a groove opened toward the side. The first member (10), which has a cross section of a shape and extends back and forth, is coupled to the first member so as to cooperate with the first member to form a closed cross-section structure (12), and the first member. It has a second member (11) protruding downward from the first member, and the coupling mechanism is arranged below the first member and is coupled to the second member.

According to this aspect, since the second member functioning as a mounting portion for mounting the coupling mechanism to the side frame forms a part of the closed cross-sectional structure of the side frame, the rigidity of the mounting structure of the coupling mechanism to the side frame is increased. improves. Further, since the coupling mechanism is arranged below the first member, that is, below the closed cross-sectional structure, an increase in the left-right width of the coupling mechanism and the side frame assembly is suppressed. Since the coupling mechanism has a structure in which the coupling mechanism is coupled to the second member protruding below the first member, the mounting structure of the coupling mechanism is simple. Further, since the coupling mechanism can be coupled to the second member from the horizontal direction, the mounting work becomes easier as compared with the case of mounting from below.

Further, in the above aspect, the front frame is arranged inside the first member and is coupled to the first member by extending rearward from the left and right ends of the base portion (6A) extending to the left and right. It is preferable to have an end portion (6B).

According to this aspect, the overlap between the front frame and the side frame is increased, and the rigidity of the joint portion between the first member and the front frame is improved.

Further, in the above aspect, the end portion of the front frame plunges into the front receiving hole (13) defined between the first member and the second member, and the first member and the second member. It should be combined with.

According to this aspect, since the front frame is coupled to both the first member and the second member, the rigidity of the side frame is further improved.

Further, in the above aspect, the front frame may be formed of a pipe material, and the second member may have a bulging portion (11C) curved along the outer surface of an end portion of the front frame.

According to this aspect, the rigidity of the second member is improved by the bulging portion, and the rigidity of the side frame is further improved.

Further, in the above aspect, the first member includes a first side wall portion (10A) extending vertically, a first upper wall portion (10B) protruding laterally from the upper and lower ends of the first side wall portion, and a first member. The cross section is formed in a groove shape with the first lower wall portion (10C), and the protruding end of the first lower wall portion is further provided with a projecting piece portion (10F) protruding laterally. The two members extend downward from the second upper wall portion (11B) coupled to the first upper wall portion so as to overlap with the first upper wall portion, and project downward from the first lower wall portion. It is preferable that the second side wall portion (11A) is provided and an insertion hole (11G) through which the projecting piece portion passes is formed in the second side wall portion.

According to this aspect, the displacement of the first member and the second member is restricted by the contact between the projecting piece portion and the hole wall of the insertion hole, so that the rigidity of the side frame is improved.

Further, in the above aspect, it is preferable that the portion of the protruding piece portion protruding from the insertion hole is provided with a locking portion for locking another member.

According to this aspect, the protruding piece portion can be used as a support portion for attaching another member to the seat cushion frame.

Further, in the above aspect, the second side wall portion may have a reinforcing structure (15) extending vertically from above the first lower wall portion to below the first lower wall portion.

According to this aspect, the rigidity of the second member is improved. In particular, it is possible to improve the rigidity of the portion of the second member to which the coupling mechanism is coupled.

Further, in the above aspect, a rear wall portion (10E) projecting in the same direction as the first side wall portion is provided at the rear end of the first side wall portion, and the trailing edge (11E) of the second side wall portion is provided. Is arranged in front of the rear wall portion, defines a posterior receiving hole with the rear wall portion, and the end portion of the rear frame is fitted into the rear receiving hole, and the first It is preferable that the member and the second member are connected to each other.

According to this aspect, the rigidity of the joint portion between the rear frame and the side frame is improved. Further, since the rear frame is connected to both the first member and the second member, the rigidity of the side frame is improved.

Further, in the above aspect, the rear wall portion may connect the first upper wall portion and the first lower wall portion and extend along the outer surface of the rear frame.

According to this aspect, the rigidity of the first member is improved.

Further, in the above aspect, the intermediate portions of the front frame and the rear frame in the left-right direction are connected by a connecting frame (8) extending in the front-rear direction, and a holder for holding a cable is connected to the connecting frame. It is preferable that the coupling hole (8A) to be formed is formed.

According to this aspect, the rigidity of the seat cushion frame is improved by the connecting frame. Further, the connecting frame can be used as a support portion for attaching the holder to the seat cushion frame.

According to the above configuration, in the vehicle seat which is a tumble seat, the attachment structure of the coupling mechanism to be coupled to the striker provided on the floor to the seat cushion can be made highly rigid and simple.

A perspective view of the frame of the vehicle seat according to the embodiment as viewed from the front left. A perspective view of the frame showing the periphery of the right cushion side frame in an enlarged manner (arrow II part in FIG. 1, the striker is omitted). Side view of the frame as seen along arrow III in FIG. IV-IV sectional view of FIG. Enlarged perspective view of the periphery of the connecting frame (arrow V in FIG. 1)

Hereinafter, an embodiment in which the vehicle seat according to the present invention is applied to the rear seats (including the second and third rows) of an automobile will be described with reference to the drawings. In the following explanation, the left and right are determined based on the occupant seated on the seat. In the left-right direction, the center side of the seat is called the inside, and the opposite side is called the outside. For the same configuration provided in pairs on the left and right, a common number will be assigned and the description will be omitted.

As shown in FIGS. 1 and 2, the seat S has a seat cushion S1 including a seat cushion frame F1 and left and right seat backs S2 including a seat back frame F2. The seat cushion frame F1 is supported by the floor FL via a pair of left and right support arms 2 and a pair of left and right strikers 3 provided on the floor FL of the vehicle.

Each of the left and right support arms 2 projects upward from the floor FL and rotatably supports the front end portion of the seat cushion frame F1 at the upper end portion about a rotation axis extending left and right. The support arm 2 is formed of, for example, a sheet metal member. The upper end portion of the support arm 2 extends forward with respect to the lower end portion.

Each of the left and right strikers 3 has a pair of left and right side pillars 3A extending upward from the floor FL and a beam portion 3B extending left and right between the upper ends of the left and right side pillars 3A. Is formed in. The lower part of the rear portion of the seat cushion frame F1 is detachably connected (attached / detached) to the left and right strikers 3 and is supported from below in the beam portion 3B.

The seat cushion S1 is formed by attaching a pad (not shown) and a skin to the seat cushion frame F1. The seat back S2 is formed by attaching a pad and a skin (not shown) to the seat back frame F2. The seat cushion frame F1 and the seat back frame F2 are formed by combining a metal plate-shaped member, a pipe material, a rod-shaped member, and the like.

The left and right seat back frames F2 are each provided so as to be rotatable (tilted) with respect to the seat cushion frame F1. A reclining mechanism R for fixing the seat back frame F2 to an arbitrary rotation position with respect to the seat cushion frame F1 is interposed between the seat cushion frame F1 and each seat back frame F2.

As shown in FIGS. 1 and 2, the seat cushion frame F1 includes a pair of left and right cushion side frames 5 extending in the front-rear direction, a front frame 6 spanned between the front portions of the cushion side frames 5, and each cushion side. It has a rear frame 7 that is hung between the rear portions of the frame 5, and a connecting frame 8 that extends back and forth and connects the intermediate portions of the front frame 6 and the rear frame 7 in the left-right direction, and is formed in a frame shape. There is. The front frame 6 and the rear frame 7 are formed of a pipe material having a circular cross section. The front frame 6 has a front frame base portion 6A extending to the left and right, and left and right front frame end portions 6B bent with respect to the front frame base portion 6A and extending rearward from both ends of the base portion. The rear frame 7 extends linearly to the left and right.

The left and right cushion side frames 5 have a symmetrical structure. As shown in FIGS. 2 to 4, each cushion side frame 5 is formed by combining a first member 10 and a second member 11 which are sheet metal members. The second member 11 is arranged inward to the left and right of the first member 10 (in the case of the right cushion side frame 5, to the left of the first member 10). The first member 10 projects inward to the left and right from each of the first side wall portion 10A whose main surface faces left and right and extends back and forth, and the upper edge, lower edge, leading edge, and trailing edge of the first side wall portion 10A. It has a first upper wall portion 10B, a first lower wall portion 10C, a first front wall portion 10D, and a first rear wall portion 10E extending along each edge. As shown in FIG. 4, the cross section (cross section seen from the front and back) of the first member 10 is directed inward to the left and right by the first side wall portion 10A, the first upper wall portion 10B, and the first lower wall portion 10C. It forms an open groove.

As shown in FIGS. 2 and 3, the leading edge and the trailing edge of the first side wall portion 10A are formed in a semicircular shape when viewed from the left and right, and the first front wall portion 10D and the first rear wall portion 10E are formed. It extends up and down while curving along the leading and trailing edges. The upper ends of the first front wall portion 10D and the first rear wall portion 10E are connected to the front and rear ends of the first upper wall portion 10B, and the lower ends of the first front wall portion 10D and the first rear wall portion 10E are the first lower. It is connected to the front end and the rear end of the wall portion 10C. The first upper wall portion 10B, the first lower wall portion 10C, the first front wall portion 10D, and the first rear wall portion 10E are continuous so as to form a closed cross-sectional structure when viewed from the left-right direction.

As shown in FIGS. 2 to 4, in the second member 11, the main surface faces left and right, and the second side wall portion 11A extending in the front-rear direction and the upper edge of the second side wall portion 11A project outward from the left and right. It has a second upper wall portion 11B extending back and forth along the upper edge. The second member 11 is shorter in the front-rear direction than the first member 10, and is arranged corresponding to the rear portion of the first member 10. The second member 11 is in contact with the lower surface of the first upper wall portion 10B, and the left and right outer surfaces of the second side wall portion 11A are in contact with the protruding ends of the first lower wall portion 10C. It is arranged on the first member 10, and the second member 11 and the first member 10 are welded in appropriate places. As a result, when viewed from the front and back, the first member 10 and the second member 11 cooperate to form a closed cross-section structure 12 having a substantially quadrangular cross section. The second side wall portion 11A extends downward from the first lower wall portion 10C.

A bulging portion 11C bulging toward the left and right inward is formed on the front portion and the upper portion of the second side wall portion 11A. The bulging portion 11C projects forward beyond the leading edge of the second side wall portion 11A. The bulging portion 11C has a cross section that is convex toward the left and right inward in a substantially arc shape when viewed from the front and back. The lower edge of the bulging portion 11C extends outward to the left and right along the lower surface of the first lower wall portion 10C, and the upper edge of the bulging portion 11C extends inward and downward to the left and right with respect to the protruding end of the first upper wall portion 10B. It is arranged through a gap in. The first member 10 and the bulging portion 11C cooperate with each other to define an anterior receiving hole 13 having a substantially C-shaped cross-sectional shape. The lower edge of the bulging portion 11C is welded in place on the first lower wall portion 10C. The second member 11 has a second front wall portion 11D that protrudes outward from the front edge of the second side wall portion 11A and is smoothly continuous with the lower edge of the bulging portion 11C.

As shown in FIG. 3, a circular notch 11E is formed on the trailing edge of the second side wall portion 11A. A substantially circular posterior receiving hole 14 is defined by the edge of the notch 11E, the first posterior wall portion 10E, and the first upper wall portion 10B. The second member 11 has a second rear wall portion 11F protruding to the left and right outward from a portion located below the first lower wall portion 10C at the trailing edge of the second side wall portion 11A.

As shown in FIGS. 2 to 4, at the protruding end of the first lower wall portion 10C, a protruding piece portion 10F that further protrudes inward to the left and right is formed. An insertion hole 11G penetrating in the thickness direction is formed in a portion of the second side wall portion 11A corresponding to the projecting piece portion 10F. The projecting piece portion 10F passes through the insertion hole 11G and projects inward to the left and right of the second side wall portion 11A. A locking hole 10G, which is a through hole, is formed at a protruding end of the projecting piece portion 10F protruding from the second side wall portion 11A. When a load is applied to the second member 11 or the first member 10, the protrusion 10F abuts on the edge of the insertion hole 11G, thereby restricting the displacement of the second member 11 with respect to the first member 10.

The second side wall portion 11A has a reinforcing structure 15 before and after the insertion hole 11G. In the present embodiment, the reinforcing structure 15 is a bead in which the second side wall portion 11A is bulged inward to the left and right. The reinforcing structure 15 extends from above the first lower wall portion 10C to below the first lower wall portion 10C. The reinforcing structure 15 preferably extends from the vicinity of the upper edge to the vicinity of the lower edge of the second side wall portion 11A. One reinforcing structure 15 is provided before and after the insertion hole 11G.

As shown in FIGS. 2 and 3, the front frame end portion 6B is arranged inside the grooved cross section of the first member 10, and the first side wall portion 10A, the first upper wall portion 10B, and the first lower wall portion are arranged. It abuts on 10C. Further, the rear end of the front frame end portion 6B is inserted into the front side receiving hole 13 and abuts on the first side wall portion 10A, the first upper wall portion 10B, the first lower wall portion 10C, and the bulging portion 11C. The front frame end portion 6B is welded in place to the first member 10 and the bulging portion 11C.

The left and right ends of the rear frame 7 are inserted into the rear receiving holes 14, and the left and right end faces are in contact with the left and right inner surfaces of the first side wall portion 10A. Further, the outer peripheral surface of the rear frame 7 is in contact with the edges of the first upper wall portion 10B, the first rear wall portion 10E, the first lower wall portion 10C, and the notch portion 11E of the second side wall portion 11A. The rear frame 7 is welded to appropriate positions on the first upper wall portion 10B, the first rear wall portion 10E, the first lower wall portion 10C, and the second side wall portion 11A.

As shown in FIG. 2, the left and right cushion side frames 5 are rotatably coupled to the upper end portion of each support arm 2 at the front end portion of each first side wall portion 10A about a rotation axis extending to the left and right. .. The joint portion between the front end portion of the first side wall portion 10A and the upper end portion of the support arm 2 is surrounded by the protective member 16. The protective member 16 is formed by bending a metal rod and is welded to the front frame 6. The protective member 16 prevents the pad of the seat cushion S1 and the fingers of the occupant from approaching the joint portion of the first side wall portion 10A and the support arm 2.

As shown in FIGS. 3 and 4, the coupling mechanism 20 is coupled to the left and right outer surfaces of the portion of the second side wall portion 11A that protrudes downward from the first lower wall portion 10C. The coupling mechanism 20 has a casing 23 composed of a base plate 21 and a cover plate 22 which are sheet metal members, a hook 24 rotatably supported in the casing 23, and an urging member 25 for urging the hook 24. The base plate 21 and the cover plate 22 are arranged so that their main surfaces face left and right and face each other. The cover plate 22 is fastened to the base plate 21 at the front end and the rear end, and the intermediate portion in the front-rear direction bulges away from the base plate 21. As a result, an internal space 26 is formed between the base plate 21 and the cover plate 22 in the intermediate portion in the front-rear direction. The portions of the base plate 21 and the cover plate 22 that define the internal space 26 are fastened to each other via spacers (not shown). The lower edge portion of the portion forming the internal space 26 of the cover plate 22 is bent toward the base plate 21 side, and the lower edge portion of the internal space 26 is closed.

At the lower portions of the base plate 21 and the cover plate 22, slits 28 are formed so as to penetrate each of them in the thickness direction and extend upward. The slits 28 of the base plate 21 and the cover plate 22 are formed in a shape that coincides with each other when viewed from the left and right. The hook 24 is arranged in the internal space 26 and is rotatably supported by the base plate 21 and the cover plate 22 in the shaft portion 24A. The hook 24 is rotatable about the shaft portion 24A between a lock position protruding toward the lower portion (open end side) of the slit 28 and a release position retracting from the slit 28. The urging member 25 is a tension coil spring, has one end coupled to the locking shaft 24B of the hook 24 and the other end coupled to the cover plate 22, and urges the hook 24 toward the lock position. ing.

The coupling mechanism 20 is arranged so that the base plate 21 abuts on the left and right outer surfaces of the portion of the second side wall portion 11A protruding below the first lower wall portion 10C, and the cover plate 22, the base plate 21, and the second side wall portion are arranged. It is fastened to the second side wall portion 11A by a fastening member 29 that integrally connects 11A. The fastening member 29 may be, for example, a bolt and a nut. The coupling mechanism 20 is fastened to the second side wall portion 11A by a fastening member 29 at one location at the front end portion and at two locations at the rear end portion. The front end portion of the coupling mechanism 20 is fastened to the portion on the front side of the front side reinforcing structure 15 of the second side wall portion 11A, and the rear end portion of the connecting portion is fastened to the portion on the rear side of the rear reinforcing structure 15. There is. The coupling mechanism 20 is arranged below the first lower wall portion 10C in a state where the coupling mechanism 20 is fastened to the second side wall portion 11A. That is, it is arranged below the closed cross-sectional structure 12 formed by the first member 10 and the second member 11. The slit 28 is arranged between the two reinforcing structures 15 in the front-rear direction, and the upper end portion (bottom portion) of the slit 28 is arranged below the lower edge of the second side wall portion 11A.

As shown in FIG. 3, at the position where the sheet S is used, the beam portion 3B of the striker 3 is arranged in the slit 28 of the coupling mechanism 20, and the upper end portion of the slit 28 is placed on the beam portion 3B. The outer edge (lower edge) of the hook 24 at the locked position is arranged so as to be inclined with respect to the horizontal plane, and when the beam portion 3B enters the slit 28, the hook 24 resists the urging force of the urging member 25. It is pushed away by the beam portion 3B toward the release position side. When the beam portion 3B reaches the upper end portion of the slit 28, the hook 24 returns to the locked position by the urging force of the urging member 25, and the beam portion 3B cannot be separated from the slit 28.

As shown in FIGS. 3 and 4, one end of the control cable 32 is coupled to the locking shaft 24B of the hook 24. The other end of the control cable 32 is coupled to a lever 31 rotatably coupled to the rear frame 7. A strap (not shown) that the occupant grips and pulls is connected to the lever 31. When the occupant pulls the strap, the hook 24 moves to the release position against the urging force of the urging member 25 via the lever 31 and the control cable 32. In this state, the beam portion 3B of the striker 3 can be separated from the slit 28.

As shown in FIG. 5, the connecting frame 8 has a quadrangular cross section, is formed of square pipes extending in the front-rear direction, and has a front end portion welded to an intermediate portion in the left-right direction of the front frame 6 and a rear frame 7. It has a welded rear end at the middle in the left-right direction. The connecting frame 8 has a plurality of connecting holes 8A penetrating in the left-right direction on the left and right side wall portions. A holder (not shown) for holding a cable such as a wire harness or a control cable is connected to the coupling hole 8A. The holder may be, for example, a clip (fastener) made of resin and may have an elastic claw that is inserted into and hooked into the coupling hole 8A.

A frame-shaped support member 8B projecting to the left and right with respect to the connecting frame 8 is coupled to the upper surface of the connecting frame 8. The support member 8B is formed of, for example, a bent metal rod. A plurality of springs 34 extending back and forth are hung between the front frame 6 and the rear frame 7. The support member 8B and the spring 34 support the pad of the seat cushion S1 from below.

As shown in FIG. 1, a support block 36 projecting upward from the rear frame 7 is coupled to the middle of the rear frame 7 in the left-right direction. A support shaft 37 protruding to the left and right is provided at the upper end of the support block 36. Support plates 39 are fastened to the left and right outer surfaces of the rear end portions of the first side wall portions 10A of the left and right first members 10. The support plate 39 projects upward from the first side wall portion 10A. The right seat back frame F2 is rotatably supported on the right support plate 39 and the right support shaft 37 of the support block 36, and the left support plate 39 and the left support shaft 37 of the support block 36 are rotatably supported. The left seat back frame F2 is rotatably supported.

The seat back frame F2 on the right side has an upper side and a lower side extending to the left and right, and a left side and a right side extending vertically, and is joined to a pipe frame 41 formed in a quadrangular frame shape and the left and right side sides of the pipe frame 41. It has left and right backside frames 42, a frame-shaped expansion frame 43 coupled to the upper side of the pipe frame 41 and extending upward, and a pan frame 44 coupled to the rear of the pipe frame 41 and the expansion frame 43. The right backside frame 42 is rotatably supported by the support plate 39 via the reclining mechanism R, and the left backside frame 42 is rotatably supported by the right support shaft 37 of the support block 36. Since the seat back frame F2 on the left side has a symmetrical structure with the seat back frame F2 on the right side, the above description of the seat back frame F2 on the right side is incorporated, and the description thereof will be omitted.

With the above configuration, the coupling mechanism 20 is arranged below the closed cross-section structure 12, and the support plate 39, that is, the rotation shaft of the seat back frame F2 is arranged above the closed cross-section structure 12. That is, the coupling mechanism 20 is arranged below the rotation axis of the seat back frame F2.

The sheet S configured as described above can be transformed from the used state to the tumble stored state. First, the seat back S2 is rotated forward with respect to the seat cushion S1 by operating the reclining mechanism R of the seat S in the used state, and the seat back S2 is folded on the seat cushion S1. By pulling the strap from this state to release the coupling mechanism 20 and raising the rear portion of the seat cushion S1 forward and upward with the front end of the seat cushion S1 as the center of rotation, the seat S is in the tumble storage state.

The effect of the sheet S configured as described above will be described. In the seat S according to the present embodiment, the rigidity of the cushion side frame 5 is improved by the closed cross-sectional structure 12 formed by the first member 10 and the second member 11. Since the second member 11 that functions as an attachment portion for attaching the coupling mechanism 20 to the cushion side frame 5 forms a part of the closed cross-sectional structure 12 of the cushion side frame 5, the coupling mechanism 20 is attached to the cushion side frame 5. The rigidity of the structure is improved. Further, since the coupling mechanism 20 is arranged below the first member 10, that is, below the closed cross-sectional structure 12, an increase in the left-right width of the assembly including the coupling mechanism 20 and the cushion side frame 5 is suppressed. Since the coupling mechanism 20 has a structure in which the coupling mechanism 20 is fastened to the second member 11 protruding downward from the first member 10 from the left-right direction, the mounting structure of the coupling mechanism 20 is simple. Further, since the coupling mechanism 20 can be coupled to the second member 11 from the horizontal direction, the mounting work becomes easier as compared with the case where the coupling mechanism 20 is mounted from below.

Further, in the joint portion between the coupling mechanism 20 and the second member 11, the base plate 21 and the second side wall portion 11A are laminated and arranged, so that the rigidity of the coupling mechanism 20 and the second member 11 is improved.

The front frame end portion 6B is arranged in a groove composed of a first upper wall portion 10B, a first side wall portion 10A, and a first lower wall portion 10C of the first member 10, and a first upper wall portion 10B and a first side wall portion. Since it is coupled to the first member 10 in a state of being in contact with the 10A and the first lower wall portion 10C, the rigidity of the seat cushion S1 frame is improved. Further, the front frame is formed in the front receiving hole 13 defined by the bulging portion 11C of the second member 11, the first upper wall portion 10B of the first member 10, the first side wall portion 10A, and the first lower wall portion 10C. The first member 10 is in a state where the rear end portion of the end portion 6B is inserted and the front frame 6 is in contact with the first upper wall portion 10B, the first side wall portion 10A, the first lower wall portion 10C, and the bulging portion 11C. And because it is coupled to the second member 11, the rigidity of the seat cushion S1 frame is improved. Further, the rigidity of the second member 11 is improved by the bulging portion 11C of the three-dimensional structure.

The rigidity of the second member 11 is improved by the bulging portion 11C of the three-dimensional structure and the reinforcing structure 15. Since the reinforcing structure 15 extends from the portion of the second member 11 forming the closed cross-section structure 12 to the portion to which the coupling mechanism 20 is fastened, the load applied from the coupling mechanism 20 to the second member 11 is applied to the closed cross-section structure 12 portion. Can be efficiently transmitted to.

The rear frame 7 is inserted into the rear receiving hole 14 defined by the first member 10 and the second member 11, and is coupled to the closed cross-sectional structure 12 formed by the first member 10 and the second member 11, so that the cushion is cushioned. The rigidity of the coupling structure of the side frame 5 and the rear frame 7 is improved, and the rigidity of the cushion side frame 5 is improved.

Since the support plate 39 that rotatably supports the seat back frame F2 is coupled to the portion forming the closed cross-sectional structure 12 of the first member 10, the rigidity of the support plate 39 is improved and the seat back frame F2 is stable. It is well supported.

Since the front frame 6 and the rear frame 7 are connected by the connecting frame 8, the opening of the frame-shaped seat cushion frame F1 is divided into two, and the rigidity of the seat cushion frame F1 is improved. The connecting frame 8 also functions as a support portion, and can support other members such as cables at the central portion of the seat cushion S1.

Although the description of the specific embodiment is completed above, the present invention can be widely modified without being limited to the above embodiment. In the above embodiment, the second member 11 is arranged on the left and right inside of the first member 10, but the second member 11 may be arranged on the left and right outside of the first member 10.

2: Support arm 3: Striker 5: Cushion side frame 6: Front frame 6A: Front frame base 6B: Front frame end 7: Rear frame 8: Connecting frame 8A: Coupling hole 10: First member 10A: First side wall 10B: First upper wall portion 10C: First lower wall portion 10D: First front wall portion 10E: First rear wall portion 10F: Projection portion 10G: Locking hole 11: Second member 11A: Second side wall portion 11B : Second upper wall portion 11C: Swelling portion 11E: Notch portion 11G: Insertion hole 12: Closed cross-sectional structure 13: Front receiving hole 14: Rear receiving hole 15: Reinforcing structure 20: Coupling mechanism 24: Hook 28: Slit FL : Floor F1: Seat cushion frame F2: Seat back frame R: Reclining mechanism S: Seat S1: Seat cushion S2: Seat back

Claims (10)

A vehicle seat comprising a seat cushion frame having a front portion rotatably supported with respect to the floor and a rear portion provided with a coupling mechanism that is detachably coupled to a striker provided on the floor.
The seat cushion frame has a pair of left and right side frames extending in the front-rear direction, a front frame connecting the front ends of the left and right side frames, and a rear frame connecting the rear portions of the left and right side frames.
Each of the side frames has a first member and a second member that is coupled to the first member and projects downward from the first member.
The lower part of the first member and the second member form a joint portion connected to each other.
The coupling mechanism is coupled to the second member below the first member.
The coupling mechanism comprises a slit through which the striker enters.
A vehicle seat in which the joint portion is arranged on an extension line of the slit when viewed from the left-right direction. The first member has a protruding piece portion protruding laterally, and has a protruding piece portion.
The second member has an insertion hole through which the projecting piece portion passes.
The vehicle seat according to claim 1, wherein the joint portion is formed by the protrusion portion passing through the insertion hole. The first member extends back and forth with a groove-shaped cross section that opens laterally.
The vehicle seat according to claim 2, wherein the second member cooperates with the first member to form a closed cross-sectional structure. The vehicle seat according to claim 2 or 3, wherein the second member has a reinforcing structure before and after the insertion hole. The vehicle seat according to claim 4, wherein the reinforcing structure is a bead. The vehicle seat according to claim 5, wherein the reinforcing structure extends vertically from above the joint portion to below the joint portion. The vehicle seat according to claim 6, wherein the reinforcing structure extends in parallel with the extending direction of the slit. The vehicle seat according to any one of claims 4 to 7, wherein the striker is arranged between two adjacent reinforcing structures in the front-rear direction. The coupling mechanism has a base plate which is a sheet metal member, and has a base plate.
The base plate extends up and down along the second member, the lower part of the base plate fastened to the second member, and the upper part of the base plate extending laterally from the upper end of the lower part of the base plate and located below the closed cross-sectional structure. The vehicle seat according to claim 3. The vehicle seat according to claim 9, wherein the upper portion of the base plate is orthogonal to the lower portion of the base plate.

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